<DOCUMENT>
<TYPE>EX-99.906CERT
<SEQUENCE>4
<FILENAME>cert906.txt
<DESCRIPTION>906 CERT
<TEXT>
        CERTIFICATION PURSUANT TO RULE 30A-2(B) UNDER THE 1940 ACT AND
                      SECTION 906 OF THE SARBANES-OXLEY ACT

I, Donald F. Crumrine, Director, Chairman of the Board and Chief Executive
Officer of Flaherty & Crumrine Preferred Income Opportunity Fund Incorporated
(the "Registrant"), certify that:

     1.   The Form N-CSR of the Registrant (the "Report") fully complies with
          the requirements of Section 13(a) or 15(d) of the Securities Exchange
          Act of 1934, as amended; and

     2.   The information contained in the Report fairly presents, in all
          material respects, the financial condition and results of operations
          of the Registrant.


Date: 1/28/09                           /s/ Donald F. Crumrine
                                        ----------------------------------------
                                        Donald F. Crumrine, Director,
                                        Chairman of the Board and
                                        Chief Executive Officer
                                        (principal executive officer)

I, R. Eric Chadwick, Chief Financial Officer, Treasurer, and Vice President of
Flaherty & Crumrine Preferred Income Opportunity Fund Incorporated (the
"Registrant"), certify that:

     1.   The Form N-CSR of the Registrant (the "Report") fully complies with
          the requirements of Section 13(a) or 15(d) of the Securities Exchange
          Act of 1934, as amended; and

     2.   The information contained in the Report fairly presents, in all
          material respects, the financial condition and results of operations
          of the Registrant.


Date: 1/28/09                           /s/ R. Eric Chadwick
                                        ----------------------------------------
                                        R. Eric Chadwick,
                                        Chief Financial Officer,
                                        Treasurer, and Vice President
                                        (principal financial officer)

</TEXT>
</DOCUMENT>
